drivers/net/wireless/ath/ath6kl/htc_hif.c

   1 /*
   2  * Copyright (c) 2007-2011 Atheros Communications Inc.
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #include "core.h"
  18 #include "target.h"
  19 #include "hif-ops.h"
  20 #include "htc_hif.h"
  21 #include "debug.h"
  22
  23 #define MAILBOX_FOR_BLOCK_SIZE          1
  24
  25 #define ATH6KL_TIME_QUANTUM     10  /* in ms */
  26
  27 static int ath6kldev_cp_scat_dma_buf(struct hif_scatter_req *req, bool from_dma)
  28 {
  29         u8 *buf;
  30         int i;
  31
  32         buf = req->virt_dma_buf;
  33
  34         for (i = 0; i < req->scat_entries; i++) {
  35
  36                 if (from_dma)
  37                         memcpy(req->scat_list[i].buf, buf,
  38                                req->scat_list[i].len);
  39                 else
  40                         memcpy(buf, req->scat_list[i].buf,
  41                                req->scat_list[i].len);
  42
  43                 buf += req->scat_list[i].len;
  44         }
  45
  46         return 0;
  47 }
  48
  49 int ath6kldev_rw_comp_handler(void *context, int status)
  50 {
  51         struct htc_packet *packet = context;
  52
  53         ath6kl_dbg(ATH6KL_DBG_HTC_RECV,
  54                    "ath6kldev_rw_comp_handler (pkt:0x%p , status: %d\n",
  55                    packet, status);
  56
  57         packet->status = status;
  58         packet->completion(packet->context, packet);
  59
  60         return 0;
  61 }
  62
  63 static int ath6kldev_proc_dbg_intr(struct ath6kl_device *dev)
  64 {
  65         u32 dummy;
  66         int status;
  67
  68         ath6kl_err("target debug interrupt\n");
  69
  70         ath6kl_target_failure(dev->ar);
  71
  72         /*
  73          * read counter to clear the interrupt, the debug error interrupt is
  74          * counter 0.
  75          */
  76         status = hif_read_write_sync(dev->ar, COUNT_DEC_ADDRESS,
  77                                      (u8 *)&dummy, 4, HIF_RD_SYNC_BYTE_INC);
  78         if (status)
  79                 WARN_ON(1);
  80
  81         return status;
  82 }
  83
  84 /* mailbox recv message polling */
  85 int ath6kldev_poll_mboxmsg_rx(struct ath6kl_device *dev, u32 *lk_ahd,
  86                               int timeout)
  87 {
  88         struct ath6kl_irq_proc_registers *rg;
  89         int status = 0, i;
  90         u8 htc_mbox = 1 << HTC_MAILBOX;
  91
  92         for (i = timeout / ATH6KL_TIME_QUANTUM; i > 0; i--) {
  93                 /* this is the standard HIF way, load the reg table */
  94                 status = hif_read_write_sync(dev->ar, HOST_INT_STATUS_ADDRESS,
  95                                              (u8 *) &dev->irq_proc_reg,
  96                                              sizeof(dev->irq_proc_reg),
  97                                              HIF_RD_SYNC_BYTE_INC);
  98
  99                 if (status) {
 100                         ath6kl_err("failed to read reg table\n");
 101                         return status;
 102                 }
 103
 104                 /* check for MBOX data and valid lookahead */
 105                 if (dev->irq_proc_reg.host_int_status & htc_mbox) {
 106                         if (dev->irq_proc_reg.rx_lkahd_valid &
 107                             htc_mbox) {
 108                                 /*
 109                                  * Mailbox has a message and the look ahead
 110                                  * is valid.
 111                                  */
 112                                 rg = &dev->irq_proc_reg;
 113                                 *lk_ahd =
 114                                         le32_to_cpu(rg->rx_lkahd[HTC_MAILBOX]);
 115                                 break;
 116                         }
 117                 }
 118
 119                 /* delay a little  */
 120                 mdelay(ATH6KL_TIME_QUANTUM);
 121                 ath6kl_dbg(ATH6KL_DBG_HTC_RECV, "retry mbox poll : %d\n", i);
 122         }
 123
 124         if (i == 0) {
 125                 ath6kl_err("timeout waiting for recv message\n");
 126                 status = -ETIME;
 127                 /* check if the target asserted */
 128                 if (dev->irq_proc_reg.counter_int_status &
 129                     ATH6KL_TARGET_DEBUG_INTR_MASK)
 130                         /*
 131                          * Target failure handler will be called in case of
 132                          * an assert.
 133                          */
 134                         ath6kldev_proc_dbg_intr(dev);
 135         }
 136
 137         return status;
 138 }
 139
 140 /*
 141  * Disable packet reception (used in case the host runs out of buffers)
 142  * using the interrupt enable registers through the host I/F
 143  */
 144 int ath6kldev_rx_control(struct ath6kl_device *dev, bool enable_rx)
 145 {
 146         struct ath6kl_irq_enable_reg regs;
 147         int status = 0;
 148
 149         /* take the lock to protect interrupt enable shadows */
 150         spin_lock_bh(&dev->lock);
 151
 152         if (enable_rx)
 153                 dev->irq_en_reg.int_status_en |=
 154                         SM(INT_STATUS_ENABLE_MBOX_DATA, 0x01);
 155         else
 156                 dev->irq_en_reg.int_status_en &=
 157                     ~SM(INT_STATUS_ENABLE_MBOX_DATA, 0x01);
 158
 159         memcpy(&regs, &dev->irq_en_reg, sizeof(regs));
 160
 161         spin_unlock_bh(&dev->lock);
 162
 163         status = hif_read_write_sync(dev->ar, INT_STATUS_ENABLE_ADDRESS,
 164                                      &regs.int_status_en,
 165                                      sizeof(struct ath6kl_irq_enable_reg),
 166                                      HIF_WR_SYNC_BYTE_INC);
 167
 168         return status;
 169 }
 170
 171 int ath6kldev_submit_scat_req(struct ath6kl_device *dev,
 172                               struct hif_scatter_req *scat_req, bool read)
 173 {
 174         int status = 0;
 175
 176         if (read) {
 177                 scat_req->req = HIF_RD_SYNC_BLOCK_FIX;
 178                 scat_req->addr = dev->ar->mbox_info.htc_addr;
 179         } else {
 180                 scat_req->req = HIF_WR_ASYNC_BLOCK_INC;
 181
 182                 scat_req->addr =
 183                         (scat_req->len > HIF_MBOX_WIDTH) ?
 184                         dev->ar->mbox_info.htc_ext_addr :
 185                         dev->ar->mbox_info.htc_addr;
 186         }
 187
 188         ath6kl_dbg((ATH6KL_DBG_HTC_RECV | ATH6KL_DBG_HTC_SEND),
 189                    "ath6kldev_submit_scat_req, entries: %d, total len: %d mbox:0x%X (mode: %s : %s)\n",
 190                    scat_req->scat_entries, scat_req->len,
 191                    scat_req->addr, !read ? "async" : "sync",
 192                    (read) ? "rd" : "wr");
 193
 194         if (!read && scat_req->virt_scat) {
 195                 status = ath6kldev_cp_scat_dma_buf(scat_req, false);
 196                 if (status) {
 197                         scat_req->status = status;
 198                         scat_req->complete(dev->ar->htc_target, scat_req);
 199                         return 0;
 200                 }
 201         }
 202
 203         status = ath6kl_hif_scat_req_rw(dev->ar, scat_req);
 204
 205         if (read) {
 206                 /* in sync mode, we can touch the scatter request */
 207                 scat_req->status = status;
 208                 if (!status && scat_req->virt_scat)
 209                         scat_req->status =
 210                                 ath6kldev_cp_scat_dma_buf(scat_req, true);
 211         }
 212
 213         return status;
 214 }
 215
 216 static int ath6kldev_proc_counter_intr(struct ath6kl_device *dev)
 217 {
 218         u8 counter_int_status;
 219
 220         ath6kl_dbg(ATH6KL_DBG_IRQ, "counter interrupt\n");
 221
 222         counter_int_status = dev->irq_proc_reg.counter_int_status &
 223                              dev->irq_en_reg.cntr_int_status_en;
 224
 225         ath6kl_dbg(ATH6KL_DBG_IRQ,
 226                 "valid interrupt source(s) in COUNTER_INT_STATUS: 0x%x\n",
 227                 counter_int_status);
 228
 229         /*
 230          * NOTE: other modules like GMBOX may use the counter interrupt for
 231          * credit flow control on other counters, we only need to check for
 232          * the debug assertion counter interrupt.
 233          */
 234         if (counter_int_status & ATH6KL_TARGET_DEBUG_INTR_MASK)
 235                 return ath6kldev_proc_dbg_intr(dev);
 236
 237         return 0;
 238 }
 239
 240 static int ath6kldev_proc_err_intr(struct ath6kl_device *dev)
 241 {
 242         int status;
 243         u8 error_int_status;
 244         u8 reg_buf[4];
 245
 246         ath6kl_dbg(ATH6KL_DBG_IRQ, "error interrupt\n");
 247
 248         error_int_status = dev->irq_proc_reg.error_int_status & 0x0F;
 249         if (!error_int_status) {
 250                 WARN_ON(1);
 251                 return -EIO;
 252         }
 253
 254         ath6kl_dbg(ATH6KL_DBG_IRQ,
 255                    "valid interrupt source(s) in ERROR_INT_STATUS: 0x%x\n",
 256                    error_int_status);
 257
 258         if (MS(ERROR_INT_STATUS_WAKEUP, error_int_status))
 259                 ath6kl_dbg(ATH6KL_DBG_IRQ, "error : wakeup\n");
 260
 261         if (MS(ERROR_INT_STATUS_RX_UNDERFLOW, error_int_status))
 262                 ath6kl_err("rx underflow\n");
 263
 264         if (MS(ERROR_INT_STATUS_TX_OVERFLOW, error_int_status))
 265                 ath6kl_err("tx overflow\n");
 266
 267         /* Clear the interrupt */
 268         dev->irq_proc_reg.error_int_status &= ~error_int_status;
 269
 270         /* set W1C value to clear the interrupt, this hits the register first */
 271         reg_buf[0] = error_int_status;
 272         reg_buf[1] = 0;
 273         reg_buf[2] = 0;
 274         reg_buf[3] = 0;
 275
 276         status = hif_read_write_sync(dev->ar, ERROR_INT_STATUS_ADDRESS,
 277                                      reg_buf, 4, HIF_WR_SYNC_BYTE_FIX);
 278
 279         if (status)
 280                 WARN_ON(1);
 281
 282         return status;
 283 }
 284
 285 static int ath6kldev_proc_cpu_intr(struct ath6kl_device *dev)
 286 {
 287         int status;
 288         u8 cpu_int_status;
 289         u8 reg_buf[4];
 290
 291         ath6kl_dbg(ATH6KL_DBG_IRQ, "cpu interrupt\n");
 292
 293         cpu_int_status = dev->irq_proc_reg.cpu_int_status &
 294                          dev->irq_en_reg.cpu_int_status_en;
 295         if (!cpu_int_status) {
 296                 WARN_ON(1);
 297                 return -EIO;
 298         }
 299
 300         ath6kl_dbg(ATH6KL_DBG_IRQ,
 301                 "valid interrupt source(s) in CPU_INT_STATUS: 0x%x\n",
 302                 cpu_int_status);
 303
 304         /* Clear the interrupt */
 305         dev->irq_proc_reg.cpu_int_status &= ~cpu_int_status;
 306
 307         /*
 308          * Set up the register transfer buffer to hit the register 4 times ,
 309          * this is done to make the access 4-byte aligned to mitigate issues
 310          * with host bus interconnects that restrict bus transfer lengths to
 311          * be a multiple of 4-bytes.
 312          */
 313
 314         /* set W1C value to clear the interrupt, this hits the register first */
 315         reg_buf[0] = cpu_int_status;
 316         /* the remaining are set to zero which have no-effect  */
 317         reg_buf[1] = 0;
 318         reg_buf[2] = 0;
 319         reg_buf[3] = 0;
 320
 321         status = hif_read_write_sync(dev->ar, CPU_INT_STATUS_ADDRESS,
 322                                      reg_buf, 4, HIF_WR_SYNC_BYTE_FIX);
 323
 324         if (status)
 325                 WARN_ON(1);
 326
 327         return status;
 328 }
 329
 330 /* process pending interrupts synchronously */
 331 static int proc_pending_irqs(struct ath6kl_device *dev, bool *done)
 332 {
 333         struct ath6kl_irq_proc_registers *rg;
 334         int status = 0;
 335         u8 host_int_status = 0;
 336         u32 lk_ahd = 0;
 337         u8 htc_mbox = 1 << HTC_MAILBOX;
 338
 339         ath6kl_dbg(ATH6KL_DBG_IRQ, "proc_pending_irqs: (dev: 0x%p)\n", dev);
 340
 341         /*
 342          * NOTE: HIF implementation guarantees that the context of this
 343          * call allows us to perform SYNCHRONOUS I/O, that is we can block,
 344          * sleep or call any API that can block or switch thread/task
 345          * contexts. This is a fully schedulable context.
 346          */
 347
 348         /*
 349          * Process pending intr only when int_status_en is clear, it may
 350          * result in unnecessary bus transaction otherwise. Target may be
 351          * unresponsive at the time.
 352          */
 353         if (dev->irq_en_reg.int_status_en) {
 354                 /*
 355                  * Read the first 28 bytes of the HTC register table. This
 356                  * will yield us the value of different int status
 357                  * registers and the lookahead registers.
 358                  *
 359                  *    length = sizeof(int_status) + sizeof(cpu_int_status)
 360                  *             + sizeof(error_int_status) +
 361                  *             sizeof(counter_int_status) +
 362                  *             sizeof(mbox_frame) + sizeof(rx_lkahd_valid)
 363                  *             + sizeof(hole) + sizeof(rx_lkahd) +
 364                  *             sizeof(int_status_en) +
 365                  *             sizeof(cpu_int_status_en) +
 366                  *             sizeof(err_int_status_en) +
 367                  *             sizeof(cntr_int_status_en);
 368                  */
 369                 status = hif_read_write_sync(dev->ar, HOST_INT_STATUS_ADDRESS,
 370                                              (u8 *) &dev->irq_proc_reg,
 371                                              sizeof(dev->irq_proc_reg),
 372                                              HIF_RD_SYNC_BYTE_INC);
 373                 if (status)
 374                         goto out;
 375
 376                 if (AR_DBG_LVL_CHECK(ATH6KL_DBG_IRQ))
 377                         ath6kl_dump_registers(dev, &dev->irq_proc_reg,
 378                                          &dev->irq_en_reg);
 379
 380                 /* Update only those registers that are enabled */
 381                 host_int_status = dev->irq_proc_reg.host_int_status &
 382                                   dev->irq_en_reg.int_status_en;
 383
 384                 /* Look at mbox status */
 385                 if (host_int_status & htc_mbox) {
 386                         /*
 387                          * Mask out pending mbox value, we use "lookAhead as
 388                          * the real flag for mbox processing.
 389                          */
 390                         host_int_status &= ~htc_mbox;
 391                         if (dev->irq_proc_reg.rx_lkahd_valid &
 392                             htc_mbox) {
 393                                 rg = &dev->irq_proc_reg;
 394                                 lk_ahd = le32_to_cpu(rg->rx_lkahd[HTC_MAILBOX]);
 395                                 if (!lk_ahd)
 396                                         ath6kl_err("lookAhead is zero!\n");
 397                         }
 398                 }
 399         }
 400
 401         if (!host_int_status && !lk_ahd) {
 402                 *done = true;
 403                 goto out;
 404         }
 405
 406         if (lk_ahd) {
 407                 int fetched = 0;
 408
 409                 ath6kl_dbg(ATH6KL_DBG_IRQ,
 410                            "pending mailbox msg, lk_ahd: 0x%X\n", lk_ahd);
 411                 /*
 412                  * Mailbox Interrupt, the HTC layer may issue async
 413                  * requests to empty the mailbox. When emptying the recv
 414                  * mailbox we use the async handler above called from the
 415                  * completion routine of the callers read request. This can
 416                  * improve performance by reducing context switching when
 417                  * we rapidly pull packets.
 418                  */
 419                 status = htc_rxmsg_pending_handler(dev->htc_cnxt,
 420                                                    &lk_ahd, &fetched);
 421                 if (status)
 422                         goto out;
 423
 424                 if (!fetched)
 425                         /*
 426                          * HTC could not pull any messages out due to lack
 427                          * of resources.
 428                          */
 429                         dev->chk_irq_status_cnt = 0;
 430         }
 431
 432         /* now handle the rest of them */
 433         ath6kl_dbg(ATH6KL_DBG_IRQ,
 434                    "valid interrupt source(s) for other interrupts: 0x%x\n",
 435                    host_int_status);
 436
 437         if (MS(HOST_INT_STATUS_CPU, host_int_status)) {
 438                 /* CPU Interrupt */
 439                 status = ath6kldev_proc_cpu_intr(dev);
 440                 if (status)
 441                         goto out;
 442         }
 443
 444         if (MS(HOST_INT_STATUS_ERROR, host_int_status)) {
 445                 /* Error Interrupt */
 446                 status = ath6kldev_proc_err_intr(dev);
 447                 if (status)
 448                         goto out;
 449         }
 450
 451         if (MS(HOST_INT_STATUS_COUNTER, host_int_status))
 452                 /* Counter Interrupt */
 453                 status = ath6kldev_proc_counter_intr(dev);
 454
 455 out:
 456         /*
 457          * An optimization to bypass reading the IRQ status registers
 458          * unecessarily which can re-wake the target, if upper layers
 459          * determine that we are in a low-throughput mode, we can rely on
 460          * taking another interrupt rather than re-checking the status
 461          * registers which can re-wake the target.
 462          *
 463          * NOTE : for host interfaces that makes use of detecting pending
 464          * mbox messages at hif can not use this optimization due to
 465          * possible side effects, SPI requires the host to drain all
 466          * messages from the mailbox before exiting the ISR routine.
 467          */
 468
 469         ath6kl_dbg(ATH6KL_DBG_IRQ,
 470                    "bypassing irq status re-check, forcing done\n");
 471
 472         if (!dev->chk_irq_status_cnt)
 473                 *done = true;
 474
 475         ath6kl_dbg(ATH6KL_DBG_IRQ,
 476                    "proc_pending_irqs: (done:%d, status=%d\n", *done, status);
 477
 478         return status;
 479 }
 480
 481 /* interrupt handler, kicks off all interrupt processing */
 482 int ath6kldev_intr_bh_handler(struct ath6kl *ar)
 483 {
 484         struct ath6kl_device *dev = ar->htc_target->dev;
 485         int status = 0;
 486         bool done = false;
 487
 488         /*
 489          * Reset counter used to flag a re-scan of IRQ status registers on
 490          * the target.
 491          */
 492         dev->chk_irq_status_cnt = 0;
 493
 494         /*
 495          * IRQ processing is synchronous, interrupt status registers can be
 496          * re-read.
 497          */
 498         while (!done) {
 499                 status = proc_pending_irqs(dev, &done);
 500                 if (status)
 501                         break;
 502         }
 503
 504         return status;
 505 }
 506
 507 static int ath6kldev_enable_intrs(struct ath6kl_device *dev)
 508 {
 509         struct ath6kl_irq_enable_reg regs;
 510         int status;
 511
 512         spin_lock_bh(&dev->lock);
 513
 514         /* Enable all but ATH6KL CPU interrupts */
 515         dev->irq_en_reg.int_status_en =
 516                         SM(INT_STATUS_ENABLE_ERROR, 0x01) |
 517                         SM(INT_STATUS_ENABLE_CPU, 0x01) |
 518                         SM(INT_STATUS_ENABLE_COUNTER, 0x01);
 519
 520         /*
 521          * NOTE: There are some cases where HIF can do detection of
 522          * pending mbox messages which is disabled now.
 523          */
 524         dev->irq_en_reg.int_status_en |= SM(INT_STATUS_ENABLE_MBOX_DATA, 0x01);
 525
 526         /* Set up the CPU Interrupt status Register */
 527         dev->irq_en_reg.cpu_int_status_en = 0;
 528
 529         /* Set up the Error Interrupt status Register */
 530         dev->irq_en_reg.err_int_status_en =
 531                 SM(ERROR_STATUS_ENABLE_RX_UNDERFLOW, 0x01) |
 532                 SM(ERROR_STATUS_ENABLE_TX_OVERFLOW, 0x1);
 533
 534         /*
 535          * Enable Counter interrupt status register to get fatal errors for
 536          * debugging.
 537          */
 538         dev->irq_en_reg.cntr_int_status_en = SM(COUNTER_INT_STATUS_ENABLE_BIT,
 539                                                 ATH6KL_TARGET_DEBUG_INTR_MASK);
 540         memcpy(&regs, &dev->irq_en_reg, sizeof(regs));
 541
 542         spin_unlock_bh(&dev->lock);
 543
 544         status = hif_read_write_sync(dev->ar, INT_STATUS_ENABLE_ADDRESS,
 545                                      &regs.int_status_en, sizeof(regs),
 546                                      HIF_WR_SYNC_BYTE_INC);
 547
 548         if (status)
 549                 ath6kl_err("failed to update interrupt ctl reg err: %d\n",
 550                            status);
 551
 552         return status;
 553 }
 554
 555 int ath6kldev_disable_intrs(struct ath6kl_device *dev)
 556 {
 557         struct ath6kl_irq_enable_reg regs;
 558
 559         spin_lock_bh(&dev->lock);
 560         /* Disable all interrupts */
 561         dev->irq_en_reg.int_status_en = 0;
 562         dev->irq_en_reg.cpu_int_status_en = 0;
 563         dev->irq_en_reg.err_int_status_en = 0;
 564         dev->irq_en_reg.cntr_int_status_en = 0;
 565         memcpy(&regs, &dev->irq_en_reg, sizeof(regs));
 566         spin_unlock_bh(&dev->lock);
 567
 568         return hif_read_write_sync(dev->ar, INT_STATUS_ENABLE_ADDRESS,
 569                                    &regs.int_status_en, sizeof(regs),
 570                                    HIF_WR_SYNC_BYTE_INC);
 571 }
 572
 573 /* enable device interrupts */
 574 int ath6kldev_unmask_intrs(struct ath6kl_device *dev)
 575 {
 576         int status = 0;
 577
 578         /*
 579          * Make sure interrupt are disabled before unmasking at the HIF
 580          * layer. The rationale here is that between device insertion
 581          * (where we clear the interrupts the first time) and when HTC
 582          * is finally ready to handle interrupts, other software can perform
 583          * target "soft" resets. The ATH6KL interrupt enables reset back to an
 584          * "enabled" state when this happens.
 585          */
 586         ath6kldev_disable_intrs(dev);
 587
 588         /* unmask the host controller interrupts */
 589         ath6kl_hif_irq_enable(dev->ar);
 590         status = ath6kldev_enable_intrs(dev);
 591
 592         return status;
 593 }
 594
 595 /* disable all device interrupts */
 596 int ath6kldev_mask_intrs(struct ath6kl_device *dev)
 597 {
 598         /*
 599          * Mask the interrupt at the HIF layer to avoid any stray interrupt
 600          * taken while we zero out our shadow registers in
 601          * ath6kldev_disable_intrs().
 602          */
 603         ath6kl_hif_irq_disable(dev->ar);
 604
 605         return ath6kldev_disable_intrs(dev);
 606 }
 607
 608 int ath6kldev_setup(struct ath6kl_device *dev)
 609 {
 610         int status = 0;
 611
 612         spin_lock_init(&dev->lock);
 613
 614         /*
 615          * NOTE: we actually get the block size of a mailbox other than 0,
 616          * for SDIO the block size on mailbox 0 is artificially set to 1.
 617          * So we use the block size that is set for the other 3 mailboxes.
 618          */
 619         dev->htc_cnxt->block_sz = dev->ar->mbox_info.block_size;
 620
 621         /* must be a power of 2 */
 622         if ((dev->htc_cnxt->block_sz & (dev->htc_cnxt->block_sz - 1)) != 0) {
 623                 WARN_ON(1);
 624                 goto fail_setup;
 625         }
 626
 627         /* assemble mask, used for padding to a block */
 628         dev->htc_cnxt->block_mask = dev->htc_cnxt->block_sz - 1;
 629
 630         ath6kl_dbg(ATH6KL_DBG_TRC, "block size: %d, mbox addr:0x%X\n",
 631                    dev->htc_cnxt->block_sz, dev->ar->mbox_info.htc_addr);
 632
 633         ath6kl_dbg(ATH6KL_DBG_TRC,
 634                    "hif interrupt processing is sync only\n");
 635
 636         status = ath6kldev_disable_intrs(dev);
 637
 638 fail_setup:
 639         return status;
 640
 641 }